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OPTIME III, technology with a double casing minimizes resonance in the holder casing, which allows maximum high-frequency attenuation, audio connection between the inner volume and the volume between the casings allows maximum low frequency attenuation. Rings are filled with soft plastic foam for more comfort. Sound attenuation 35 db. Suitable for extremely noisy environments.
| Norms |
Norms
EN 352-1 |
| Brand |
Brand
3M |
